如图所示的电路中，电源电动势E=10V，内阻r=0.5Ω，电动机的电阻R₀=1.0Ω，电阻R₁=1.5Ω．电动机正常工作时，电压表的示数U₁=3.0V，求：

已知椭圆$E:\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$$\left(a>b>0\right)$的右焦点为$F\left(3,0\right)$,过点$F$的直线交椭圆于$A,B$两点.若$AB$的中点坐标为（1，-1）,则$E$的方程为  （　　）

下列四地位于南回归线上的是（　　）

2010年4月，美国科学家通过阻断一种名为Skp2的基因，能够使癌细胞老化并死亡．这一发现或许能为治疗癌症提供一种新方法．据介绍，阻断癌细胞中的Skp2基因能够触发“衰老进程”，迫使癌细胞像体细胞暴露在阳光下那样“干死”，无法无限分裂、在体内转移．研究人员以两组老鼠为对象进行实验，这些老鼠在基因经过改造后会患上一种前列腺癌，但其中一组老鼠的Skp2基因遭阻断，6个月后，这组老鼠没有长出肿瘤，而Skp2基因未遭阻断的另一组老鼠长出肿瘤．研究人员从那组没有长肿瘤的老鼠身上提取淋巴腺和前列腺组织，发现其中许多癌细胞开始老化，细胞分裂速度减慢．研究人员向实验鼠体内植入人类癌细胞，结果也发现这些癌细胞发生老化．

根据材料，回答下列问题：

语法填空

    My program is a course in automotive repair. We teach people from the age of 16 through adults. We're ____ (locate)on a high school campus. It's vocational,____ means that we train people specific skills that they could use in a job.

    I like classes like this ____it's ____(much)of the real world than it is sitting there reading a textbook, not ____(know)what you are going to be using it for.

    Today's a work day, so ____I go back into the shop, I have all of my students ____(work)on a project. First, Jack is going to get the air tools out and jack up a car, he's going to take a tyre off that car, with the air impact. Every student that comes onto my program is an individual. All of them think that they're going to be able to fix their own car. They all have ____as a goal that they are going to get out of the program.____ then, as part of my introduction to the class I'll let them know some of the other things that they'll all get,____ include：consumer understanding of how the car works.